Dan Carter still a major threat off the bench, warns Brian O’Driscoll

Carter, second left, could be a key player for Racing against Leinster. Sexton, left, Nakarawa, second right and Leavy, right, also have important roles to play

At the age of 36 and about to bring his sojourn in European rugby to an end, Dan Carter is on the verge of making his final appearances on the game’s grandest stages. Just as he bowed out of the international game in the grandest style at the 2015 World Cup, today the former New Zealand fly half has the opportunity to lift the European Champions Cup with Racing 92, a trophy his club covet, but have yet to win.

There is still the Top 14 title to play for before Carter departs for Japan to top up his pension pot at the end of the season, but the Champions Cup is the prize that he would most dearly love to add to the Super…